Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 Update: April 2014

Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 Update is a cumulative update that includes all previous released security updates and nonsecurity updates. In addition to previous updates, it includes improvements such as improved Internet Explorer 11 compatibility for enterprise applications, usability improvements, extended mobile device management and improved hardware support.

Important All future security and nonsecurity updates for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 require this update to be installed. We recommend that you install this update on your Windows RT 8.1, Windows 8.1, or Windows Server 2012 R2-based computer in order to receive continued future updates.
Note   Note
Note Windows Update may offer update 2919355 again even when the computer already has update 2919355 installed. This is expected, and is in order to resolve a Windows Update client issue. Windows Update only installs the additional fixes for Windows Update clients instead of all the Windows 8.1 update packages.


Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 Update: April 2014

Windows Update Client does not scan against WSUS 3.0 SP2 if HTTPS is configured and TLS 1.2 is not enabled

Some computers that have the Windows 8.1 and Windows Server 2012 R2 Update (KB 2919355) installed stop scanning against Windows Server Update Services 3.0 Service Pack 2 (WSUS 3.0 SP2 or WSUS 3.2)-based servers that are configured to use HTTPS and do not have TLS 1.2 enabled.

This problem occurs only when the following conditions are true:
The computer is running Windows 8.1 or Windows Server 2012 R2 and has the KB 2919355 update installed.
The computer is managed by a WSUS 3.2-based server.
WSUS 3.2 server is configured to have the managed clients communicate with the WSUS server over HTTPS by using Secure Sockets Layer (SSL) or Transport Layer Security (TLS).
The WSUS 3.2 server does not support the TLS 1.2 protocol.
Windows Update Client does not scan against WSUS 3.0 SP2 if HTTPS is configured and TLS 1.2 is not enabled

A Guy